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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd84a33b6503f08dae381f7eb28af2a9ea6e8a91afa089da2633218ae42cb4d' 
  AND token = 'goIG5DxQaKhqOBpQBv/2YM1H7ySte7qRS735fGyljJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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