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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa9f24336a4bce95e7d665607c85d4b728fe9be609322fe44c5536082031023' 
  AND token = 'GsDA1CX1R/hbSQdFWb2AjhiPrsSpOVu//HjlO3tVljw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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