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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0848153c4f9aa7af49367f0684127ab28054d0d9b28579f8b9055e20d03e5e76' 
  AND token = 'qIpNXQG6MwQmrR9IBZ1lK4mA8I894Oi9ICicGzLorsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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