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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c895ac0f6c2e0e094cf913fa351f8c006a8b3c9a28213b39b0249e98f7c97ed' 
  AND token = 'bWvxBnAJgRgYQyn4sO6w0pSe6V+L8CJjw1FiIZDJ0kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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