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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be4563a931fe81e64d65286b55d5032439adda4222b74779dd09b6f4cce4b3c3' 
  AND token = 'u1nYSwEOU5LgmlBX/2e5ovVLKROtHD7w2s5j6MS78X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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