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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '558a105e73830afa7d580755cc43e0434d4af68f3fa934b0b01013a1fc19268c' 
  AND token = '94edjcOvqD3/SoI+znlfCJeicIeqpifcE4ja8jFTxPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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