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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aaec6c4836da4e77f73440619b87105a18c56f8ea8d90554489b057c1ad01f5' 
  AND token = '8tSHm2tmlLZ4NhsnLdEuAPuSMsQZbnEMbs/ZS9n+lWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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