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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acc156d86edefc2146850850628f37cdc457dc404a7fb0362397b6aada15db83' 
  AND token = 'snkccubI3BKYMaXZ8RW3awZz5Ebusm1VwTv/du+cFnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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