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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b3ef6daf476485f96cb4d70bbd6404bc25b7ca9745e03e8723eeb95f747a3b' 
  AND token = 'ucxWtHdhCNgEFxOL+ckYM0lccpQrmisK7/4zHIa7fMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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