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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce07bd695035561336af93ae2cfd27988e8ccde6b8d632a8fde24b01743dd8e7' 
  AND token = '3dtrh5iPqzsWv9CF3wbyh6PmbdGwQD9EDbw7kd94JyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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