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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8fe2a96033e6e68bfd26407a7533bb230fce8e7fe603b50cf0e9ba6df2aa648' 
  AND token = 'GjZ1Y4djBL+0MOj8E5BMUGGsONO73xLDj7jdc63pdQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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