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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b31d98760263514636c47325a07790b690ca2f57ac28eb61930cbfb66d6954' 
  AND token = 'JXXn2RNl55XYEwo/jrAZd41ZpDgw3cNPQ0t2sik54ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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