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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5b0f9564c9a90fbd028c2f7b02787d7dd5c21c3336ee92d3d30174aca85c9cc' 
  AND token = 'tZlJ6Ebv8fAqQlc60laLEP5mIk76cAkitOIinWtYKh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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