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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd73bd7586cdd2aa54a1e45c3120ffd8c070d9a54754312787fbac005ffdcb2d2' 
  AND token = '4jhOm7lCTbscwUVqDg+9Pkmk6SLxQrHfev9J3svdgvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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