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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46baf4d33d925860749fb0de1748a44aab94baf412fd0dedc54c99f38839985b' 
  AND token = 'Yr4fg8k9gR7vVDU4I2690nSvGTaNl3PYkyZq1ryPO24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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