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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831c5b9a16441fb913731f1ab5d5e8b84bb5e95aae51994bc61b171b8a20247e' 
  AND token = 'zQ33qjDBKkvwkiqKQGqlQ2+q2AWTTiSR7M9Nh1qpkR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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