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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc292d26b16f83472b4f685a287e4eca01fcd2a4c5a014bedecbc26b47785cf5' 
  AND token = 'Lzrdem8vQOGgNzQ5WaspiUIvoezcB/J+WpI5btmi2IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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