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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea9030230119ae7c13cba2d6c81d764f377e67d2e39eee2de9b18b3b5e4ab6a' 
  AND token = 'oRGnX/HNrOaP5AW5BmUEhZJGmw3Kp7vX1Fw77LXE0bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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