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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084819dfc95c74b1e6bf18b0defa0c4d66b0759678da51578d9fc81847f8ffa6' 
  AND token = 'MygP3zS4eMnTX+O7lum5HVIdOhjEhO65hBk3HqUBoHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}