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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f1bf81f081262b9d66584e1dd4b95047d2e0207d1b40dbea72039cb2ba48d80' 
  AND token = 'OEk85krBUbf1Fx/n7vUajAyaps6V8Ca8jRFAouGYi28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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