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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72907ebe141649b31af2963710b57cd3f1b759babd008fdf56461ddadd25dc84' 
  AND token = 'OLh8d3QvGZ7ZAbQA/yR2auhMERE31yAIjrsBxNjCPgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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