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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7bd35c2b091f2033b7ff72b4f9f227d7b34c31b750650ecfce21a90ef0f089d' 
  AND token = 'CPY1S6GT/sIhJ5HdW8jz7/Fo9uw00zP2J1b4abRoHRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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