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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c57c9aa2c2c1af1740f3fc8c32cbd65871433b8dbcfff7c28411b6f639587d' 
  AND token = 'bKWDKVcea5O3i5EsbRkZAHBqG9iN3yPsS16KVagb3YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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