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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b95cc4494b995b9ae6d7a79b8d345f07ed79254b26aadac35333eb68bd747179' 
  AND token = 'bQP8K6CqO+jUD7r1xpMOxsenfuGEYCn3OqjG/Tfx8iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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