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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7326100e3707ac6836671d01260639a26a58f4567f0d1f7dca46b6cabb8b42a' 
  AND token = 'I2mUg6eV0fkQSYgy9vkyrt8x8i4UMtODEgBcUoIal/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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