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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f50b2c51f539b3c590966a0d557c0061cc5e7b3173d93df7a0671777258c84' 
  AND token = 'm9xqKcyp/RGoNZQFZkMh+CTT4ikTCp7v8LAvqgEYSm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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