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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b27a6282c55ef023ee245a82ed94be88d72d7e76ffd4b3d1538469c0432067fc' 
  AND token = 'MjjO1bXSUNd6FL3lsIWVnXubSzzZk5YvduILou34Kyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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