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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37aadc3533830f31591fb27040d6dba71be0391cc78beca5efb20903514f8361' 
  AND token = 'zznragDlqcUEFW7WknXKym0CiyQ05KqRlrHGhjHNaaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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