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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa7b3b9d7b07a5345c50f5d424076c01e79cd6988915c5ad58741d5bff88f09' 
  AND token = 'j2vBcUVnXFw1H1ymo3eHclaXMHsxvHmG2QZEAmIjkaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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