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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d5e378d1da5bde937d5a3f0a02d450a891391f4e484bc4e6eab60f00cb53db' 
  AND token = 'rsFQCKLv2oNAb8d79W/ywi0eikKjfGPl0MCvlFtX4+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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