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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bca3fb8eb6e70faa771a854183dc1ff3162870c5963b2f04bb5d27ac7623e28' 
  AND token = '8stEx18bUyzdv+tFWWg6TXFmn6Q0WdAykHcaBIw1x/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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