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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a3be6437c4631369a3d6de7b4ea5d6e69d8d9cdbb69c9b2b93e4f9f307cfdf4' 
  AND token = 'YHHrHcMKGeyQYEGjWy5zr1oUClQH0lDFHJLpsxfs5hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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