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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e40bc224c39b1aade51c7b02a86640e59a8d294ab6bc1f9a9d538f3a356da0' 
  AND token = 'r3pgL7/ud7v0LC9raqTxtLmtDLWMu++PTsSVdfoWb48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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