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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6600e6937aad8fa8c3749375f051a99ecbbee3a1918016e99f725ebbf0bbcd7f' 
  AND token = 'tmr1r4i1neLtytkRwUXstgIM/iZz+gA3aiH7j/aNb9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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