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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1ead26c4179377857a4ddd84cff039c09ee9ec60a977b1adffd2f25b4ec55c' 
  AND token = 'PSr27qE+BJe1EtKeX7Wpq5XlXZITEC7cdXR78UO7wSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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