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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50d56a5aee38b2573222abdae3aecde19561f1bcdae05a6b0b1b2b0a390cbd73' 
  AND token = 'VMteVKXU43QUWiaoE9ERcls7AAWGoyhu2SCUcYX2OB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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