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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed1caab270b17759f6f33e4df7dbbd84f111a6a8fd2df6aef6b0d2ff5a2ad0b' 
  AND token = 'l7k3Bhsv/bq+pqoM74GrkjigTyfMEqUKuTXS1oYNLh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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