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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52555d967fbb95618d9fc88f2eaa277ae73399bfc07f081a195ddd4776da1397' 
  AND token = 'Nsyty6XcnT2uEWeQl4dJYpmE8fXFYV58Z1+HZHU/7ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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