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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b54ba3c5d96141bbae60bd7d42f6906ba29b39130d167cefa531d183b7a27e6' 
  AND token = 'NRUxtzxpJOagnky916D+ONNDzu9wqXQJYINV3ccCGFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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