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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b83a935ba9163645313ec55180210724bd8cdbdb74fdeb37dcae4f3047cb038' 
  AND token = 'DByrRG1nP2EeMpd3Im6fw8qi+Ej9OfwH8RWp9eIat+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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