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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532f3cae29987ad7cb8c016c2511e08e78226ddaf206a5684c465351a67d0f99' 
  AND token = 'o4zpiSvtEhMnr3nvefEV5hIczKIEGi9z3DP1bd2VoKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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