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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63129429efbbe520d6ea796bc1a5bf2ce0785561f2a4eaa07adf4e5e383f007c' 
  AND token = 'nTtGSFDLeZ5+oSggZRtCljuCqYfxxR8EjTBJRY4oPxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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