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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bbaa18e809dc388ad5b8b518e2ab3edcd9fa05ba858d80b19a13d73de4932dc' 
  AND token = 'z3hgWim5b8u4WVypkef4ul83DVwSL3HUt9RFsqLID5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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