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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ee1a0aa7f8949f8129edc58dbd96545ab071560e2f1d69d3a13556fae3c85f' 
  AND token = 'qp8+68NEtegh82/bIp+nNQJCHcnXgN2kjnpz1VH4Su8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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