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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc8c7442c799385a9bca0cb6995eb368cf95392c4eac03ddfe1744bca4154d5' 
  AND token = 'k18LuHkjLR6V70krGDrk4rWdBHCB/MpohGWRAUO9ldc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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