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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '183d7ecfcbb8a9ffa5955b829a9d0a8168c7cb4b62be61bd380a3327b78440c6' 
  AND token = '56T6FpbL5f1bDI+ZoWViUsKOZUBi9vHkQDd9Sl+Np8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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