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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef0e7c57bc8d1f6b738013d6a42361857010280738fa20d68f62a23bfff12c0c' 
  AND token = 'NO/kYbt+yHUqvehqU6xugzwHH93kyRQVb7ExAcfF4EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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