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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b34da9cdcca226f799c2b4dfe49f3ba9ec7ca2dc9b433ac34f8748a07a10c0c' 
  AND token = 'jD3fhd7jRdzyRE+A+bgX3yOkMRMHwfXraVwC7rkBbdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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