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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70fefcc0c69a1c9b1b745a98c73e17c8dff8e8f6c951482ce387cf704e330ec9' 
  AND token = 'BZiuaMUKwJqDNXu5FEbG2liu8oBqWdKm4QmcmuIKGWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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