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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc5c70c533d4fc5aff2adf7b7e479087a4934923d28c1d713d96721dc0e0952' 
  AND token = 'Zl0QEAeB531fzFwf12K2bzU1pgkW8GhJVVgskcQgKU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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