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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f57a7c4d793f705e10e678cf8b2a47ee06f42cc3caf0c4b2b725ddc8ab28e48c' 
  AND token = 'NeKAX3qp+Vdj+vlff54s6dKbbQOiXvxFss4FKI3OUdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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