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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18358d01e6f04f162eba1084f797e58f93a8b182d77d370004bcb6f23a7db42' 
  AND token = 'EGSXAtHkWdvC00wpX9j0a99c5D8xPnXb5f+ImrKpbBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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