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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3c2d5042e4ba1d17e4c1777f98e67d6bfa26625206dcf959fc047e2b560a33' 
  AND token = 'LSX4FSbIi4NzFjDE9qw/XpdCNyT6UKBhkADfy8LJj5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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