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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b1ad2884d0da1abd302c39657c514b2db2942af0fc3d7d9556df67c8830ea8' 
  AND token = 'YYmpEp29QkLO4cfPvOCNXU4KX6QK8HpihONxoL+3EWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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