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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '223584e217ab531d33992cbb0c1d685442ec4ff3198338c7d84ef34d75824c09' 
  AND token = 'cu73KIq5gYLQKc0WHN1BCYWbI4F972724zD38P6JZ8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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