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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c359449c30707d90551a34d5d59bc8451400b97340c53ad7449aefc4fe29ecb8' 
  AND token = 'vV5i/uyCWxv8QI0M7+/vBmMiVriys58lFxrsEIV9XXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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