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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d04b71ea97305943f1627070e7e739c5dfe6da9316662ab69147d0ff3006056' 
  AND token = 'fszQ/8vUbIelXGoKipe6KOBwkgNiW3eCsj6rDf0a5+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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