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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e7c2661b6096018f25e2399055ddbd62619486849dc82022803e8fb72039bd3' 
  AND token = 'vVXzXFYbd0Xs5nd1eK8f4uSiccZkSs2exoScZ2YfWhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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