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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '723ffff9450a07e00d60ae31ad20d87b436ab0ee063cdacc501a30a7fa8902d7' 
  AND token = '1b6ZEz+owMEIN3AmKsO+HAdXKjCP92BF7AOgs5OymJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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