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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c367057bebedb84bd803f2f3e476b82efc3ae0c1d0402e50b57f3ccc08038ddc' 
  AND token = '90u6n0Jv66ajGOgwGhK7VrBGjQQYe7dQlR54v3OMU3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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