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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '826e814879eba4744decf12b6e3760fe08ccb94e8545daa1203be71f2af9a6a1' 
  AND token = 'ZF6D0la8mVgscPzseMQI8EXpmnQ44J+C3vll+qsCD88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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