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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9668dcbb8dd41576b2c4ddfd9f05c2ed06e0a59a39411552348659bf307757' 
  AND token = '7FM6o/fsf+Pz1u0lAHQq6FFc5NyOWfDiaKvtfG2ZWX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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