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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69fa8c4a3b08df4778d6c869f02eeee563117aaa26819d0b85ffa77730fd6601' 
  AND token = 'r2ByXsGSMiUvKMUy6Jr4Xm70D9hU/NNIPzgeROeWnsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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